Composition for sealing covered wire

Abstract

Provided is a composition for sealing a covered wire, the composition containing 2-cyanoacrylate including 10% by mass or more of an alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 4 or more carbon atoms, and the composition having both water resistance and thermal shock resistance under high temperature and high humidity conditions and also having excellent heat resistance.

1 . A composition for sealing a covered wire, the composition containing 2-cyanoacrylate comprising 10% by mass or more of an alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 4 or more carbon atoms. 
     
     
         2 . The composition for sealing a covered wire according to  claim 1 , wherein the alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 4 or more carbon atoms is at least one selected from the group consisting of 2-octyl-2-cyanoacrylate, 2-ethylhexyl-2-cyanoacrylate, n-octyl-2-cyanoacrylate, n-hexyl-2-cyanoacrylate, and n-butyl-2-cyanoacrylate. 
     
     
         3 . The composition for sealing a covered wire according to  claim 1 , the composition further containing at least one of an alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 1 to 3 carbon atoms or a 2-cyanoacrylate that has an ether bond in an ester residue. 
     
     
         4 . The composition for sealing a covered wire according to  claim 3 , wherein a content ratio of the alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 1 to 3 carbon atoms is 10% by mass or more but 90% by mass or less with respect to a total amount of 2-cyanoacrylate. 
     
     
         5 . The composition for sealing a covered wire according to  claim 3 , wherein a content ratio of the 2-cyanoacrylate that has an ether bond in an ester residue is 0% by mass or more but 40% by mass or less with respect to a total amount of 2-cyanoacrylate. 
     
     
         6 . The composition for sealing a covered wire according to  claim 1 , the composition further containing a (meth)acrylate that has two or more (meth)acryloyloxy groups. 
     
     
         7 . The composition for sealing a covered wire according to  claim 6 , wherein a content ratio of the (meth)acrylate that has two or more (meth)acryloyloxy groups is 50% by mass or less with respect to a total amount of the composition. 
     
     
         8 . The composition for sealing a covered wire according to  claim 6 , the composition further containing a polymerization initiator. 
     
     
         9 . A covered wire comprising a cured product of the composition for sealing a covered wire according to  claim 1 .